jdk8-mips64-public/hotspot: src/share/vm/libadt/vectset.hpp@f90c822e73f8 (annotated)

src/share/vm/libadt/vectset.hpp@f90c822e73f8 (annotated)

src/share/vm/libadt/vectset.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

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changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_LIBADT_VECTSET_HPP
 #define SHARE_VM_LIBADT_VECTSET_HPP
 #include "libadt/set.hpp"
 // Vector Sets - An Abstract Data Type
 //INTERFACE
 // These sets can grow or shrink, based on the initial size and the largest
 // element currently in them.  Slow and bulky for sparse sets, these sets
 // are super for dense sets.  They are fast and compact when dense.
 // TIME:
 // O(1) - Insert, Delete, Member, Sort
 // O(max_element) - Create, Clear, Size, Copy, Union, Intersect, Difference,
 //                  Equal, ChooseMember, Forall
 // SPACE: (max_element)/(8*sizeof(int))
 //------------------------------VectorSet--------------------------------------
 class VectorSet : public Set {
 friend class VectorSetI;        // Friendly iterator class
 protected:
   uint size;                    // Size of data IN LONGWORDS (32bits)
   uint32 *data;                 // The data, bit packed
   void slamin( const VectorSet& s );     // Initialize one set with another
   int compare(const VectorSet &s) const; // Compare set contents
   void grow(uint newsize);               // Grow vector to required bitsize
 public:
   VectorSet(Arena *arena);                      // Creates a new, empty set.
   VectorSet(const VectorSet &s) : Set(s._set_arena) {slamin(s);} // Set clone; deep-copy guts
   Set &operator =(const Set &s);                // Set clone; deep-copy guts
   VectorSet &operator =(const VectorSet &s)     // Set clone; deep-copy guts
   { if( &s != this ) { slamin(s); } return *this; }
   ~VectorSet() {}
   Set &clone(void) const { return *(new VectorSet(*this)); }
   Set &operator <<=(uint elem);          // Add member to set
   VectorSet operator << (uint elem)      // Add member to new set
   { VectorSet foo(*this); foo <<= elem; return foo; }
   Set &operator >>=(uint elem);          // Delete member from set
   VectorSet operator >> (uint elem)      // Delete member from new set
   { VectorSet foo(*this); foo >>= elem; return foo; }
   VectorSet &operator &=(const VectorSet &s); // Intersect sets into first set
   Set       &operator &=(const Set       &s); // Intersect sets into first set
   VectorSet operator & (const VectorSet &s) const
   { VectorSet foo(*this); foo &= s; return foo; }
   VectorSet &operator |=(const VectorSet &s); // Intersect sets into first set
   Set       &operator |=(const Set       &s); // Intersect sets into first set
   VectorSet operator | (const VectorSet &s) const
   { VectorSet foo(*this); foo |= s; return foo; }
   VectorSet &operator -=(const VectorSet &s); // Intersect sets into first set
   Set       &operator -=(const Set       &s); // Intersect sets into first set
   VectorSet operator - (const VectorSet &s) const
   { VectorSet foo(*this); foo -= s; return foo; }
   int operator ==(const VectorSet &s) const;  // True if sets are equal
   int operator ==(const Set       &s) const;  // True if sets are equal
   int operator < (const VectorSet &s) const;  // True if strict subset
   int operator < (const Set       &s) const;  // True if strict subset
   int operator <=(const VectorSet &s) const;  // True if subset relation holds.
   int operator <=(const Set       &s) const;  // True if subset relation holds.
   int disjoint   (const Set       &s) const;  // True if sets are disjoint
   int operator [](uint elem) const; // Test for membership
   uint getelem(void) const;         // Return a random element
   void Clear(void);                 // Clear a set
   uint Size(void) const;            // Number of elements in the Set.
   void Sort(void);                  // Sort before iterating
   int hash() const;                 // Hash function
   void Reset(void) {                // Reset a set
     memset( data, 0, size*sizeof(uint32) );
   }
   /* Removed for MCC BUG
      operator const VectorSet* (void) const { return this; } */
   const VectorSet *asVectorSet() const { return this; }
   // Expose internals for speed-critical fast iterators
   uint word_size() const { return size; }
   uint32 *EXPOSE() const { return data; }
   // Fast inlined "test and set".  Replaces the idiom:
   //     if( visited[idx] ) return;
   //     visited <<= idx;
   // With:
   //     if( visited.test_set(idx) ) return;
   //
   int test_set( uint elem ) {
     uint word = elem >> 5;           // Get the longword offset
     if( word >= size )               // Beyond the last?
       return test_set_grow(elem);    // Then grow; set; return 0;
     uint32 mask = 1L << (elem & 31); // Get bit mask
     uint32 datum = data[word] & mask;// Get bit
     data[word] |= mask;              // Set bit
     return datum;                    // Return bit
   }
   int test_set_grow( uint elem ) {    // Insert & return 0;
     (*this) <<= elem;                 // Insert into set
     return 0;                         // Return 0!
   }
   // Fast inlined test
   int test( uint elem ) const {
     uint word = elem >> 5;      // Get the longword offset
     if( word >= size ) return 0; // Beyond the last?
     uint32 mask = 1L << (elem & 31); // Get bit mask
     return data[word] & mask;   // Get bit
   }
   // Fast inlined set
   void set( uint elem ) {
     uint word = elem >> 5;      // Get the longword offset
     if( word >= size ) {        // Beyond the last?
       test_set_grow(elem);      // Then grow and set
     } else {
       uint32 mask = 1L << (elem & 31); // Get bit mask
       data[word] |= mask;       // Set bit
     }
   }
 private:
   SetI_ *iterate(uint&) const;
 };
 //------------------------------Iteration--------------------------------------
 // Loop thru all elements of the set, setting "elem" to the element numbers
 // in random order.  Inserted or deleted elements during this operation may
 // or may not be iterated over; untouched elements will be affected once.
 // Usage:  for( VectorSetI i(s); i.test(); i++ ) { body = i.elem; }
 class VectorSetI : public StackObj {
   friend class VectorSet;
   const VectorSet *s;
   uint i, j;
   uint32 mask;
   uint next(void);
 public:
   uint elem;                    // The publically accessible element
   VectorSetI( const VectorSet *vset ) :
     s(vset),
     i((uint)-1L),
     j((uint)-1L),
     mask((unsigned)(1L<<31)) {
     elem = next();
   }
   void operator ++(void) { elem = next(); }
   int test(void) { return i < s->size; }
 };
 #endif // SHARE_VM_LIBADT_VECTSET_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/libadt/vectset.hpp@f90c822e73f8 (annotated)

src/share/vm/libadt/vectset.hpp